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43d8fb2d3a
Some older libc don't define splice() and and don't define _syscall*() either, which causes build errors if splicing is enabled. To solve this, we now split the syscall redefinition into two layers : - one file per syscall (epoll, splice) - one common file to declare the _syscall*() macros The code is cleaner because files using the syscalls just have to include their respective file. It's not adviced to merge multiple syscall families into a same file if all are not intended to be used simultaneously, because defining unused static functions causes warnings to be emitted during build. As a result, the new USE_MY_SPLICE parameter was added in order to be able to define the splice() syscall separately.
84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
/*
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* include/common/splice.h
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* Splice definition for older Linux libc.
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*
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* Copyright 2000-2011 Willy Tarreau <w@1wt.eu>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation, version 2.1
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* exclusively.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifndef _COMMON_SPLICE_H
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#define _COMMON_SPLICE_H
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#if defined (__linux__) && defined(CONFIG_HAP_LINUX_SPLICE)
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#include <errno.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <common/syscall.h>
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/* On recent Linux kernels, the splice() syscall may be used for faster data copy.
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* But it's not always defined on some OS versions, and it even happens that some
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* definitions are wrong with some glibc due to an offset bug in syscall().
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*/
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#ifndef SPLICE_F_MOVE
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#define SPLICE_F_MOVE 0x1
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#endif
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#ifndef SPLICE_F_NONBLOCK
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#define SPLICE_F_NONBLOCK 0x2
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#endif
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#ifndef SPLICE_F_MORE
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#define SPLICE_F_MORE 0x4
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#endif
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#if defined(USE_MY_SPLICE)
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#if defined(CONFIG_HAP_LINUX_VSYSCALL) && defined(__linux__) && defined(__i386__)
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/* The syscall is redefined somewhere else */
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extern int splice(int fdin, loff_t *off_in, int fdout, loff_t *off_out, size_t len, unsigned long flags);
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#else
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/* We'll define a syscall, so for this we need __NR_splice. It should have
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* been provided by syscall.h.
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*/
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#ifndef __NR_splice
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#warning unsupported architecture, guessing __NR_splice=313 like x86...
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#define __NR_splice 313
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#endif /* __NR_splice */
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static _syscall6(int, splice, int, fdin, loff_t *, off_in, int, fdout, loff_t *, off_out, size_t, len, unsigned long, flags);
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#endif /* VSYSCALL */
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#else
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/* use the system's definition */
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#include <fcntl.h>
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#endif /* USE_MY_SPLICE */
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#endif /* __linux__ && CONFIG_HAP_LINUX_SPLICE */
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#endif /* _COMMON_SPLICE_H */
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/*
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* Local variables:
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* c-indent-level: 8
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* c-basic-offset: 8
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* End:
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*/
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